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The J4 uses a standard O2, and the wiring is different on the plug for the skinny-type sensor. If you just plugged a skinn-type sensor into the J4 harness you may have damaged the ECU.
Just leave the O2 sensor unplugged until you sort out your issues. You did not mention whether it helped to be unplugged or not. The SR20DET will run fine, not RICH, for years without the o2 sensor plugged in and get great fuel economy.
Did you ever perform a boost leak check, because this is the #1 most important overlooked aspect of sr20det running rich diagnosis.
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